/**
* tipc_l2_send_msg - send a TIPC packet out over an L2 interface
* @skb: the packet to be sent
* @b: the bearer through which the packet is to be sent
* @dest: peer destination address
*/
int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
struct tipc_bearer *b, struct tipc_media_addr *dest)
{
struct net_device *dev;
int delta;
void *tipc_ptr;
dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
if (!dev)
return 0;
/* Send RESET message even if bearer is detached from device */
tipc_ptr = rcu_dereference_rtnl(dev->tipc_ptr);
if (unlikely(!tipc_ptr && !msg_is_reset(buf_msg(skb))))
goto drop;
delta = dev->hard_header_len - skb_headroom(skb);
if ((delta > 0) &&
pskb_expand_head(skb, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC))
goto drop;
skb_reset_network_header(skb);
skb->dev = dev;
skb->protocol = htons(ETH_P_TIPC);
dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
dev->dev_addr, skb->len);
dev_queue_xmit(skb);
return 0;
drop:
kfree_skb(skb);
return 0;
}
/* tipc_bearer_xmit_skb - sends buffer to destination over bearer
*/
void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
struct sk_buff *skb,
struct tipc_media_addr *dest)
{
struct tipc_msg *hdr = buf_msg(skb);
struct tipc_bearer *b;
rcu_read_lock();
b = bearer_get(net, bearer_id);
if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr))))
b->media->send_msg(net, skb, b, dest);
else
kfree_skb(skb);
rcu_read_unlock();
}
/* tipc_bearer_xmit() -send buffer to destination over bearer
*/
void tipc_bearer_xmit(struct net *net, u32 bearer_id,
struct sk_buff_head *xmitq,
struct tipc_media_addr *dst)
{
struct tipc_bearer *b;
struct sk_buff *skb, *tmp;
if (skb_queue_empty(xmitq))
return;
rcu_read_lock();
b = bearer_get(net, bearer_id);
if (unlikely(!b))
__skb_queue_purge(xmitq);
skb_queue_walk_safe(xmitq, skb, tmp) {
__skb_dequeue(xmitq);
if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb))))
b->media->send_msg(net, skb, b, dst);
else
kfree_skb(skb);
}
